![WANG Cong](/assets/img/avatar_default.png)
- Make some variables and functions static, since they don't need to be global. - Remove an unused function - arch/um/kernel/time.c::sched_clock(). - Clean the style a bit as complained by checkpatch.pl. Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: WANG Cong <wangcong@zeuux.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
213 lines
5.3 KiB
C
213 lines
5.3 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include "linux/bootmem.h"
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#include "linux/mm.h"
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#include "linux/pfn.h"
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#include "asm/page.h"
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#include "as-layout.h"
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#include "init.h"
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#include "kern.h"
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#include "mem_user.h"
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#include "os.h"
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static int physmem_fd = -1;
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/* Changed during early boot */
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unsigned long high_physmem;
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extern unsigned long long physmem_size;
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int __init init_maps(unsigned long physmem, unsigned long iomem,
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unsigned long highmem)
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{
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struct page *p, *map;
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unsigned long phys_len, phys_pages, highmem_len, highmem_pages;
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unsigned long iomem_len, iomem_pages, total_len, total_pages;
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int i;
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phys_pages = physmem >> PAGE_SHIFT;
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phys_len = phys_pages * sizeof(struct page);
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iomem_pages = iomem >> PAGE_SHIFT;
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iomem_len = iomem_pages * sizeof(struct page);
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highmem_pages = highmem >> PAGE_SHIFT;
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highmem_len = highmem_pages * sizeof(struct page);
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total_pages = phys_pages + iomem_pages + highmem_pages;
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total_len = phys_len + iomem_len + highmem_len;
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map = alloc_bootmem_low_pages(total_len);
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if (map == NULL)
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return -ENOMEM;
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for (i = 0; i < total_pages; i++) {
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p = &map[i];
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memset(p, 0, sizeof(struct page));
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SetPageReserved(p);
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INIT_LIST_HEAD(&p->lru);
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}
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max_mapnr = total_pages;
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return 0;
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}
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void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
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int r, int w, int x)
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{
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__u64 offset;
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int fd, err;
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fd = phys_mapping(phys, &offset);
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err = os_map_memory((void *) virt, fd, offset, len, r, w, x);
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if (err) {
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if (err == -ENOMEM)
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printk(KERN_ERR "try increasing the host's "
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"/proc/sys/vm/max_map_count to <physical "
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"memory size>/4096\n");
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panic("map_memory(0x%lx, %d, 0x%llx, %ld, %d, %d, %d) failed, "
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"err = %d\n", virt, fd, offset, len, r, w, x, err);
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}
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}
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extern int __syscall_stub_start;
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void __init setup_physmem(unsigned long start, unsigned long reserve_end,
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unsigned long len, unsigned long long highmem)
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{
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unsigned long reserve = reserve_end - start;
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int pfn = PFN_UP(__pa(reserve_end));
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int delta = (len - reserve) >> PAGE_SHIFT;
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int err, offset, bootmap_size;
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physmem_fd = create_mem_file(len + highmem);
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offset = uml_reserved - uml_physmem;
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err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
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len - offset, 1, 1, 1);
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if (err < 0) {
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printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
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"failed - errno = %d\n", len - offset,
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(void *) uml_reserved, err);
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exit(1);
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}
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/*
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* Special kludge - This page will be mapped in to userspace processes
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* from physmem_fd, so it needs to be written out there.
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*/
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os_seek_file(physmem_fd, __pa(&__syscall_stub_start));
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os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE);
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bootmap_size = init_bootmem(pfn, pfn + delta);
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free_bootmem(__pa(reserve_end) + bootmap_size,
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len - bootmap_size - reserve);
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}
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int phys_mapping(unsigned long phys, unsigned long long *offset_out)
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{
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int fd = -1;
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if (phys < physmem_size) {
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fd = physmem_fd;
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*offset_out = phys;
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}
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else if (phys < __pa(end_iomem)) {
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struct iomem_region *region = iomem_regions;
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while (region != NULL) {
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if ((phys >= region->phys) &&
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(phys < region->phys + region->size)) {
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fd = region->fd;
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*offset_out = phys - region->phys;
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break;
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}
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region = region->next;
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}
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}
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else if (phys < __pa(end_iomem) + highmem) {
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fd = physmem_fd;
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*offset_out = phys - iomem_size;
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}
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return fd;
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}
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static int __init uml_mem_setup(char *line, int *add)
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{
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char *retptr;
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physmem_size = memparse(line,&retptr);
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return 0;
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}
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__uml_setup("mem=", uml_mem_setup,
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"mem=<Amount of desired ram>\n"
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" This controls how much \"physical\" memory the kernel allocates\n"
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" for the system. The size is specified as a number followed by\n"
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" one of 'k', 'K', 'm', 'M', which have the obvious meanings.\n"
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" This is not related to the amount of memory in the host. It can\n"
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" be more, and the excess, if it's ever used, will just be swapped out.\n"
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" Example: mem=64M\n\n"
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);
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extern int __init parse_iomem(char *str, int *add);
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__uml_setup("iomem=", parse_iomem,
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"iomem=<name>,<file>\n"
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" Configure <file> as an IO memory region named <name>.\n\n"
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);
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/*
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* This list is constructed in parse_iomem and addresses filled in in
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* setup_iomem, both of which run during early boot. Afterwards, it's
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* unchanged.
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*/
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struct iomem_region *iomem_regions;
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/* Initialized in parse_iomem and unchanged thereafter */
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int iomem_size;
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unsigned long find_iomem(char *driver, unsigned long *len_out)
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{
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struct iomem_region *region = iomem_regions;
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while (region != NULL) {
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if (!strcmp(region->driver, driver)) {
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*len_out = region->size;
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return region->virt;
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}
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region = region->next;
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}
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return 0;
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}
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static int setup_iomem(void)
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{
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struct iomem_region *region = iomem_regions;
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unsigned long iomem_start = high_physmem + PAGE_SIZE;
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int err;
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while (region != NULL) {
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err = os_map_memory((void *) iomem_start, region->fd, 0,
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region->size, 1, 1, 0);
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if (err)
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printk(KERN_ERR "Mapping iomem region for driver '%s' "
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"failed, errno = %d\n", region->driver, -err);
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else {
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region->virt = iomem_start;
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region->phys = __pa(region->virt);
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}
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iomem_start += region->size + PAGE_SIZE;
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region = region->next;
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}
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return 0;
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}
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__initcall(setup_iomem);
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